Air-feed for drills.



M. HARDSOGG.

AIB. FEED FOR DBILLS.

APPLIUATION FILED AUG. 5, 1909.

Patented Aug. 9,"1910 2 SHEETS-SHEET 1.

M. HARDSOCG.

AIR FEED rox DmLLs. A i' ,y wv APPLICATION FILED AUG-.5, 1909.

66,91 1 Patented Aug. 9, 1910.

2 SHEETS-SHEET 2.

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shown, consists ot a pneumatic han'nner tl,

ilAEcl-TEN HARDSOCG,

STATES aia-nnen non Dinius aeearia Specicatien of Letters Patent.

'Patented il,

replication tiled August 5, i909. Serial No. SRAM.

fo all whom, it may concern:

Be it known that l, Mini'rin Haansoce, a citizen Vot the United States, .residing at Ottumwa, in the etuinty ot il/apelle and State of Iowa, have invented certain new and useful hu'iprevementa in Air-Feeds for Lirills, of which the following is a specilication. i

This invention relates to an air feed for rock drills of the ordina-ry type, and has t'or its object to construct a feed which will not only advance the drill forward, but will pull the cutting tool out of the holeatter the drilling is eon'ipleted. ln the ordinair)7 type of drill, the tool is pulled out by hand. This is inipossible'in a great many eases, because the tool has become too tightly wedged in the roch; and in order to pull it out it is necessari7 to lire a blast and shatter the rock,

which usuallyT resultsin injury to the tool.

In the drawings, `Figure l is a side elevation ot a drill in operative position, inounted for use in an open quarri'grlfig. 2 a side elevation of drill in operative position, mounted. for use in tunnel work, Fig. 3 a front view ot' the niouiiting post and arni for carrying the drill; Eig. 4i a cross section ol Fig. 3; Fig; o a sectional elevation of the feeding device, showingl the pieton advanced; Fig'. 6 a similar view to Fig. 5, showing the piston witl'idrawn; Fig'. 7 a crees section oi the valve for controlling the air `lieed; and

`Fig. 8 a 'view taken on line 8MS ot Fig. f

Referring to Figs. l. and 2, the device, as

to which is attached a bit l()--the hammer and bit heini,y ot ordinary and well known type do not need any detailed description. Attached to the rear elr the hammer is an air feed ll, as shown in AFig. `l. Where the drill Viis being used in open quarry work the device is attached to a post l2 which-vis enibedded in the rock; and slidably mounted upon the post is an arni or bracket 13 which is locked in position by means ot' a set` screw 14. In the portion et the arni extending,l out from the post is mounted a bracket- 15, between the ears oi which the end 16 of a hexagonal bar 17 is pivotally secured. This construction, it will be seen, enables the drill to be moved to an)v point desired. I do not desire to limit in vselt. however, to any particular iuaniicr mounting. In Fig. 2 ot the drawings, the drill is shown mounted t'or use in tunnel work. In this instance, in place of the post. l2 toraed bar 1S used, which is mounted within a sleeve l5).

chamber d, screw-thrcaded into the rear end o'l which is a plug 2l which receives the screw-threaded end of the bar i7.' The ierward end oi the cylinder also has `screwthreaded thereinto a plug 22 which is bored lo receive a hexagonal bai-itl having a. screwthreaded end Lliwhich is entered into a piston head 25. Surroundiiig` the piston head are packing rings 2o and 2T, which are held outwardly in engagement with the side of the casing by air pressure, which enters through ports 2S torinesi in the side Walls ci the piston head.

The hexagonalbar Q3' is infovided with two longitudinal passages 2t) and 30, the :former ol which extends through the een-- ter ot the'bar and used tor supplying; air to i'eei'l the piston foi-"uniud i." the air comes through thepaseagc Q9, 'it lills the space between the` rear and of the 11' an chamber and (he rear tace oi. the piston head, moving` the pieton vforward and feed` ing the drill. the passage ill), it enters between the trout end ot the piston chamber and the trent tai-e ot `the piston, moving` the pieton rear wardly and witlnlrawin the drill l'roin the hole.- f

vAttached to the forward end. ot the he);M agonal bar 23 is a valve. casini;` 3l which contains a tapered valve member 3Q, the valve member ha ving a squared head upon its upper end, to which is attached a hainlle 323; the valve` iuen'ibcr being, held in place by means ot a plugl 3lscrew-thiearledd into the bottoni of the as-ing. A springis located within a chamber termed in the plug and bears against the under face of the valve nieinber 32, holding' the saine in 'tight engagement with the casina' and preventing undue leakage. rEhe plug 34 is formed with a passage 3G, into which is secured a coiigling` attached to the main fuir ply pipe 37. The passage 3G is also in coni a port or chamber n" inunication with o formed in the valve member, which cham-` bei* has leadingy therefrom a pan-laire 3S) which is adapted to register, when the valve .uicin'iicr is turned into various positions, with either one or the other ot the passages r li) and v-l-l formed in the valve casing'. The

i passage at) eomn'iunicates with the yasaage lheair feedingl device consists oi a piston llfhen the air is supplied td 29 formed in the center of the bar 23, and the passage 41 communicates with a groove 42 formed in the valve casing at the point where the bar 23 terminates, the groove 42 also being inv communication with the passage 30' in the bar' 23. The function of the groove is to bring the passage 30 into comvmunication with thepassage 41, no matter where the terminus of the assage 30 may be when the device is assem led. The passage 29 being in the center of the bar. will,

of course, always come into communication with the passage 40.

0n' the exterior of the valve member 38 are formed two grooves 43 and 44, the former of which bringsl the"passage 40 into communication with an exhaust passage 45 formed in the valve casing, and the latter of which brings the passage 41 into communication with an vexhaust passage 46 formed in the casing, these two grooves, of course acting alternately as the valve is turne f from one position to another. Located at piston-chamber and act upon the rear 'face I When the Avalv'eis in thisposition, the passage 8O will bein communi-v cation with the groove 44, and the air from of the;- piston.

the rearof the 'piston chamber is a vent passage 47 which lows the air to be exhausted from the piston chamber as the piston is moved forward' and causes lthe piston to advance at a slow rate of speed. By-allowing 'fa'..small or 4large quantity of air to beadinitted into the piston chamber for lfeeding the piston ',forward, the rate of feed can he varied according to the condition and 'strength of the4 rock being bored.

The operation will be understood from the foregoing, but briefly is as follows: Re fel-ring toFig. 5, which shows the piston in its most advanced ipositiomth'e passage 29 is in c'immunication with the passage 40, which in turn is in communication with the passage 39' locatedin the valve member, permitting air to iow from the valve into the in front ot' the piston will be exhausting through the passage 4G of the valve casing.

Referring to F ig. 6, the valve has been turned to bring tljiepassage 39 into communication 'with the passage 30, and is supplying air to act upon the front face of the piston,

while -the air from the rear l'aeejof the pis- .ton is being exhausted through the passage 29 lwhich is now in communication with the groove 43, which groove is in communica- -tion with. the exhaust passage 45 formed in It will thus; be seen that as the the casing. handle controlling the valve is turned, the piston will be actuated forward and back within the. piston chamber, advancing and retracting the drill, although the retraction of the drill is much more rapid than the advancement. p

I claim:

1. In an air feed for rock drills, the com'- bination of a piston chamber, a piston actuated forward and back within the chamber, a rotatable tapered valve member for controllinga medium under pressure, said valve member being provided with a chamber and with passage communicating with said chamber, a valvecasing, a barl connected to the valve casing and to the piston head, said bar having a passage extending through its center and a passage extending at one side thereof,A the valve casing having formed therein a circular groove communicatingv with'the latter passage and also having a passage communicating with the central passage in the bar and a passage communicating with the circular groove, and "a connection between the valve casing and the rock drill,

bar having longitudinally extending pas.4l

sages formed therein terminating on opposite sides 4of the piston head, the'valve casing having passages formed therein extend-vv ing in alinement and communicating with the passages in the bar, each of which is adapted to communicate withthe .passage in the valve member when the valve is turned into proper position t0 ,establish such communication, and a connection between the valve casing and the rock drill, substantially as described.

3. lin an airffeed for rockdrills, the com vbine-timpani a piston chamber, a piston actu-. ated forivard and back 'within the chamber,

a 'rotatable vvalve member for controlling a medium under pressure, said valve member Vhaving a chamber formed therein communieating with a mainuvsupply pipe, and; also having a passage communicatinggwith the chamber, a valve casing, a bar secured Ato the valve casing and to thepiston head, said bar having a central longitudinally extending passage formed therein and a passage extending parallel'therewith and at one side thereof, the passages terminating on opposite 'sides of the piston head, the valvecasing having a circular groove communicating with the passage extending at one side of the.

bar, and also having a passage communicating with the central passage in the' bar, and

a passage communicating with the circular groove, the passage in the valve member be-' mg adapted to be broughtinto communication with. either one of the passages in the valve casing, the valvecasing having oppositely disposed exhaust passages, and

the Valve' member haring circumferential A grooves so positioned that When the passage 1n the valve member is brought into communication with one of the passages in the valve casing one of the circumferential grooves in the valve member will be in posi-1" tion to establish eommunicationibetween the 4 other passage in .the valve casing and one of the exhaust tween the va ve casing and the rock drill, 10 substantially as described.

assages, and a connection be- MARTlN HARDSOCG.

Witnesses ELMER J; LAMBERT, EMMERT A. WORK. 

